IIRC, there are more (genuine) .44 Dance revolvers known than .36 caliber, something like 20 or so to 5.

It has often been written that the cylinder boss was "milled off" the Dance revolvers and much ink and ingenuity was used in attempts to explain the reasons for that anomaly. I think it was Bill Edwards who found that the boss was not "milled off"; it was never there in the first place because the frames were cut out of boiler plate.

Of course the "boss milled off" explanation was used by fakers who needed to explain the tool marks where genuine Colt frames were cut down to make fake Dance revolvers.